We can notice that there is a problem arising in the massless scalar double cut: in Eq.(REF ) one can notice that there is a non-analytic term proportional to \(1/\epsilon \) , which will give a divergent contribution that do not vanish once we take the Fourier transform. This term was not noticed in [1]}, but it is mandatory to deal with it because it is affecting a physical quantity. Since this result needs a renormalization procedure and a more accurate analysis, we will not use it to predict physical observables, but this problem need to be sorted out in future works.
